Functions to get key from coord and coord from key

src/ol/tilecoord.js

@@ -31,6 +31,26 @@ ol.tilecoord.getKeyZXY = function(z, x, y) {
 };
 
 
+/**
+ * Get the key for a tile coord.
+ * @param {ol.TileCoord} tileCoord The tile coord.
+ * @return {string} Key.
+ */
+ol.tilecoord.getKey = function(tileCoord) {
+  return ol.tilecoord.getKeyZXY(tileCoord[0], tileCoord[1], tileCoord[2]);
+};
+
+
+/**
+ * Get a tile coord given a key.
+ * @param {string} key The tile coord key.
+ * @return {ol.TileCoord} The tile coord.
+ */
+ol.tilecoord.fromKey = function(key) {
+  return key.split('/').map(Number);
+};
+
+
 /**
  * @param {ol.TileCoord} tileCoord Tile coord.
  * @return {number} Hash.

test/spec/ol/tilecoord.test.js

@@ -1,5 +1,3 @@
-
-
 goog.require('ol.tilecoord');
 goog.require('ol.tilegrid.TileGrid');
 
@@ -23,6 +21,23 @@ describe('ol.TileCoord', function() {
     });
   });
 
+  describe('getKey()', function() {
+    it('returns a key for a tile coord', function() {
+      var key = ol.tilecoord.getKey([1, 2, 3]);
+      expect(key).to.eql('1/2/3');
+    });
+  });
+
+  describe('fromKey()', function() {
+    it('returns a tile coord given a key', function() {
+      var tileCoord = [1, 2, 3];
+      var key = ol.tilecoord.getKey(tileCoord);
+
+      var returned = ol.tilecoord.fromKey(key);
+      expect(returned).to.eql(tileCoord);
+    });
+  });
+
   describe('hash', function() {
     it('produces different hashes for different tile coords', function() {
       var tileCoord1 = [3, 2, 1];